배수문에서 실내모형실험에 의한 무동력 토사제거시스템의 수리 특성

박찬근,오범환,이달원,Park, Chan Keun,Oh, Beom Hwan,Lee, Dal Won 한국농공학회 2014 한국농공학회논문집 Vol.56 No.5

In this study, the large-scale hydraulic model test was performed to investigate the hydraulic characteristics for development of the non-power soil cleaning and keeping system at the dike gate. The outlet height, outflow number, outflow discharge, and outflow cycle were compared and analyzed. The non-power soil cleaning and keeping system was most effective at 11.2 mm in the outlet height. And then the mean outflow cycle was 1.09 sec, and the mean outflow discharge was $0.00164m^3/s$. The total outflow number increased gradually as the water level of a water tank increased, and the outlet height decreased. As a level of water tank decreased, the mean outflow cycle was lengthened, and the unit outflow discharge increased. This result showed this system was most effective. To remove the silty clay deposited in facilities, the methods of excavation, dredging, high pressure washing, etc have been applied to the tidal facilities such as land reclamation, a small size fishing port, and a harbor for maintenance. However, this is extremely cost-ineffective, whereas the non-power soil cleaning and keeping system will bring about an enormously positive economic effect. In addition, when the non-power soil cleaning and keeping system is applied to the dike gate of land reclamation, a thorough examination of the local tidal data and the careful system planning are required to prevent the disaster damage caused by flooding.

The Comparison of two Nonparametric Tests in some Distributions

박찬근 한국자료분석학회 2006 Journal of the Korean Data Analysis Society Vol.8 No.3

We Compare powers of the nonparametric tests, Mann-Whitney test and Median test, under a variety of population distributions using a simulation study. Both tests require that the two underlying populations have the same variance, but this assumption was relaxed in the comparisons. We consider the following types of distributions : Normal, Uniform, Exponential, and Cauchy. Also, to investigate th effect of location shifts in mixture distribution, we use the mixture of N(0,1) and N(3,36) Each test is performed 5,000 times under the same conditions.

중국 貴州 지역의 ‘淸水江文書’를 활용한 한·중 학계의 연구 현황

박찬근 전북사학회 2023 전북사학 Vol.- No.67

The Qingshui River served as a route for local ethnic minorities engaged in forestry to transport timber to major commercial areas in China. The Qingshuijiang Documents contain not only forestry-related contracts, but also various everyday contracts. Through the local ethnic minorities' daily lives and contractual relationships depicted in these documents, their own social order is gradually being revealed. However, the discussion of how the revealed social characteristics of the ethnic minorities are related to ‘China’ seems to be proceeding separately from the publication of the document collection. Depending on how one understands ‘China,’ the perspective on viewing the society of the Qingshui River Basin is predetermined even before reading the Qingshuijiang Documents. In the Korean academic community, researchers have consistently pursued historical research with the Qingshui River Basin as a backdrop. They have mainly focused on the interaction between the representative ethnic minority in the area, the Miao people, and the Ming and Qing dynasties. Research interest has been concentrated on the conflicts and reconciliation between national power and ethnic minority society. On the other hand, for Chinese researchers, Chinese history is ‘national history.’ In this paper, it is analyzed that even if Chinese research on the Qingshui River Basin does not neglect the region's specificity, there is a tendency in the conclusion of works to mention the fusion into ‘China.’ The way of historical narration that aims to constitute the ‘nation’ is a common problem and an unavoidable issue in the historical narratives of any country. Therefore, discussing which historical narration method is absolutely the correct one without consideration of the reality of historical research becomes a detached public discourse. What is important is that the perspective on the relationship between the Qingshui River Basin and ‘China’ is clearly contrasted, and how to narrate the history of the bilateral relationship becomes a way to constitute the current ‘China.’ Depending on how ‘China’ is constituted, the legitimacy of the current unity of China can be measured, so the Qingshui River Basin can also be seen as another battleground for historical research. 청수강은 임업에 종사하는 현지 소수민족들이 벤 나무를 중국의 주요 상업지대까지 흘려보내는 루트였다. ‘청수강문서’에는 임업에 관련한 계약 문서뿐만 아니라 일상의 다양한 계약 문서들도 많다. 이들 문서에 담긴 지방 소수민족의 일상생활과 계약 관계 등을 통해 그들 나름의 사회 질서가 점차 밝혀지고 있다. 그러나 청수강 유역의 사회를 바라보는 관점은 ‘중국’을 어떻게 이해하는가에 따라 ‘청수강문서’를 열람하기 이전에 미리 예정되어 있는 것처럼 읽힌다. 한국 학계에서 일단의 연구자들이 꾸준히 귀주 청수강 유역을 배경에 두고 역사 연구를 이어왔다. 주로 이 지역의 대표적 소수민족인 묘족이 명·청대 왕조와 어떠한 길항을 겪었는가에 집중하여, 국가권력과 소수민족 사회의 갈등과 봉합에 관해 연구의 관심이 집중되었다. 반면, 중국인 연구자들에게 중국사는 ‘國史’이다. 본고에서는 중국의 청수강 유역 연구가 지역의 특수성을 좌시하지 않는다 하더라도 저작물의 결론에는 ‘중국’으로의 융합을 언급하는 서술 경향을 보이는 것으로 분석했다. ‘국민’을 구성해 내려는 국사 서술 방식이 갖는 일반적인 문제이며 어느 나라의 국사 서술도 피할 수 없는 문제일 것이다. 따라서 무턱대고 어떠한 역사 서술 방식이 절대적으로 ‘올바른 서술’인가를 논하는 것은 역사 연구의 현실 상황과 동떨어진 공론이 된다. 중요한 것은, 청수강 유역이라는 지역과 ‘중국’의 관계 설정에 관한 시각이 뚜렷하게 대비되고 있으며, 어떻게 양자간 관계의 역사를 서술하는가가 곧 현재의 ‘중국’을 구성하는 방식이 된다는 점이다. 구성해 내는 ‘중국’의 모습이 어떠한가에 따라 현재 중국의 통일성이 얼마나 정당한가가 가늠되므로, 청수강 유역 역시 또 하나의 역사 연구의 격전장이라고 할 수 있다

Asymptotic Overfitting Probabilities of some Model Selection Criteria in Large Samples

박찬근,조영석 한국자료분석학회 2007 Journal of the Korean Data Analysis Society Vol.9 No.3

We look at overfitting in large samples by obtaining asymptotic probabilities of some model selection criteria, which are AIC, AICc, AICu, SIC, HQ, HQc, Cp, FPE, and FPEu. Asymptotic Overfitting probabilities refer to comparing one overfitted model of order k_{*} +L to the reduced model of order k_{*}. We make use of the following fact : As n rarrow INF and where k_{*} and L are fixed, {chi_{ n-k_{*} -L}^{2}} over { n-k_{*} -L} rarrow 1. It is clear that AIC, AICc, FPE and Cp are not constant criteria, since their probabilities of overfitting are not 0. But SIC, HQ, and HQc are consistent and thus do have 0 probability of overfitting.

Comparisons of Overfitting Probabilities of some Model Selection Criteria in Small Samples

박찬근 한국자료분석학회 2006 Journal of the Korean Data Analysis Society Vol.8 No.4

We calculated probabilities of overfitting of some model selection criteria, which are AIC, AICc, AICu, SIC, HQ, HQc, Cp, FPE, and FPEu when the sample sizes are 25, 35, 50, and 100. And then, compared these probabilities to find some patterns of overfitting probabilities in some model selection criteria. Overfitting refers to comparing one overfitted model of order k_* + L to the reduced model of order k_*. And suppose there is a true model order k_* and we fit a candidate model of order k_* + L where L>0

언론사 조사자료 수익사업 현황과 전망

박찬근 한국조사기자협회 1998 조사연구 Vol.11 No.-

무동력 토사제거시스템의 현장모형실험

박찬근,이영학,홍석민,이달원 한국농공학회 2019 한국농공학회논문집 Vol.61 No.4

Coastal and fishing facilities are gradually deteriorating in function due to the continual accumulation of soil sediments, which has affected localeconomic activities. Currently, there are many methods to remove soil sediments, but these methods are either a temporary solution or require arepetitive removal of the soil sediments, which is a huge financial burden for the maintenance of the facilities. To solve these problems, this studyproposed a non-power soil cleaning system and evaluated field applicability by carrying out field model tests. The conditions for the evaluation focusedon the drainage-elapsed time and drainage-outflow velocity according to the water level change in the water tank. In the field test, silty clay and sandwere separately installed, and sedimentation soil removal test was practiced. As a result, the system was verified to have a sufficient outflow velocityfor the removal of soil sediments. In addition, a generalization equation that can be used in different regions of the tide was suggested in this study. These results will greatly contribute to removing soil sediments in ports and dike gate facilities on the southwest coast. Since the system is aneco-friendly technology that does not require additional energy, thus it is expected to contribute to maintenance of sustainable facility performance aswell as economic effect in the future.

A Study of Mann-Whitney Test and Median Test in Several Distributions

박찬근,신성민,허태영 한국자료분석학회 2008 Journal of the Korean Data Analysis Society Vol.10 No.2

The Mann-Whitney test and the Median test are two tests that can be used to test for a difference in location parameters. This paper compared powers of the two tests under a variety of population distributions through a simulation study. Both tests require that two underlying populations have the same variance, but this assumption was relaxed in some of the comparisons. In every cases, equal sizes of 10 and 20 were used. We compared the those two nonparametric tests when underlying distributions were mixed normal, lognormal, beta, gamma and chi-square distributions. Each test was performed 5,000 times and the SAS/MACRO used.

淸朝 道光 연간의 銀에 대한 관념과 정책 - 洋錢과 ‘倣鑄洋銀’을 중심으로 -

박찬근 동양사학회 2022 동양사학회 학술대회 발표논문집 Vol.2022 No.4

형광등용 전자식 안정기의 고조파 저감에 관한 연구

박찬근,이성근,송동영 한국해양대학교 산업기술연구소 2001 연구논문집 Vol.18 No.-

A conventional type ballast for fluorescent lamp is replaced by an electronic ballast, because of its merit. Electronic ballast have characteristics of rapid start, reduction of energy consumption, stability and so on, but it has harmonic waves by switching in high frequency. This paper proposes a highly power factor investor circuit for fluorescent lamp ballast with two state capacitors. A full-wave rectifier used as a direct current power supply at fluorescent lamp ballast contains a lot of harmonic waves caused by inrush current. Inrush current is generated near the maximum input voltage, when smoothing capacitor is charged. This study proposes a new method to control inrush current by use of charging voltage at pre- state capacitor. From the simulation result, it is confirmed that the THD(Total Harmonic Distortion) is improved about 9.1[%] and the PF(Power Factor) is improved about 2.2[%] in comparison whit that of conventional ballast